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Photosynthesis Conversion of light energy from the sun into chemical energy to make sugar.

Published byHorace Richards Modified over 8 years ago

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Presentation on theme: "Photosynthesis Conversion of light energy from the sun into chemical energy to make sugar."— Presentation transcript:

1 Photosynthesis Conversion of light energy from the sun into chemical energy to make sugar

2 Almost all plants are photosynthetic autotrophs, as are some bacteria and protists –Autotrophs generate their own food through photosynthesis (a) Mosses, ferns, and flowering plants (b) Kelp (c) Euglena(d) Cyanobacteria THE BASICS OF PHOTOSYNTHESIS

3 Light Travel in photons Higher frequency of light, more energy photon delivers Speed of light is 300 000 000 m/s

4 Electromagnetic Spectrum and Visible Light Gamma rays X-raysUV Infrared & Microwaves Radio waves Visible light Wavelength (nm)

5 Different wavelengths of visible light are seen by the human eye as different colors. WHY ARE PLANTS GREEN? Gamma rays X-raysUVInfrared Micro- waves Radio waves Visible light Wavelength (nm)

6 Sunlight minus absorbed wavelengths or colors equals the apparent color of an object. The feathers of male cardinals are loaded with carotenoid pigments. These pigments absorb some wavelengths of light and reflect others. Reflected light

7 Why are plants green? Reflected light Transmitted light

8 Chloroplasts Where photosynthesis takes place Consists of Stroma – Houses enzymes used for chemical reactions Thylakoid membranes – Form stacks of flattened disks called grana – Contains chlorophyll and other pigments

9 Chlorophyll Absorbs red light, blue light, violet light Uses light that is absorbed to excite and move electrons

10 Photosynthesis Breakdown Light Dependant Reactions – Photosystem I & II Light Independent Reactions – Calvin Cycle

11 Light Dependant Reactions Takes place in thylakoid membrane Consists of Photosystem I & II Need two photons of light Electrons are excited Reactants – Water molecule is split Products – Oxygen – ATP – energy – NADPH – electron carrier

12 Light Dependant Reactions Also called the Calvin Cycle Takes place in the stroma Plant makes sugar from carbon dioxide Reactants – CO₂ - plant gets from atmosphere through stomata – ATP used to drive reactions – NADPH used to donate electrons Products – Sugar – glucose, sucrose

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